electrokymograph
noun
                                                                                                                            
                                                            elec·tro·ky·mo·graph
                    
                                                                                                              
                                                                                                                                  -ˈkī-mə-ˌgraf  
                                                      
                                                          
            
                                
              
          
                                                      : an instrument for recording graphically the motion of the heart as seen in silhouette on a fluoroscopic screen                                      
                
                    
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  Merriam-Webster unabridged




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